Lamp



E.A. HAWTHORNE.

LAMP.

APPLICATION FILEDJAN. I6. 1917.

Patented' May 31, 1921.

l LAMP.

Specification of Letters Patent. Ilaptqented ltgty 31, 1921.

Application sied January 1e, 1,917. serial` Nb. 142,729.

To all whom t may concern:

Be it known that I, ELLswoRTHA. HAW- THoRNE, a citizen of the UnitedStates, and a resident of Bridgeport, in the county of 5 Fairfield andState of Connecticut, have invented an Improvement in Lamps, of whichthe following description, in connection with the accompanying drawings,is a specification, like characters on the drawings representing likeparts. l

y This invention Vrelates to lamps, and is more particularly concernedwith means for fastening parts ofl the lamp togetherv in sucha manner asto hold them securely, and to facilitate assembling and dismountingthem. l v

My invention will be best understood by reference to the followingdescription, when taken in connection with the accompanying drawings ofone specific embodiment thereof, while its scope will be moreparticularly pointed out in the appended claims.

In the drawings: Figure 1 is` a central, longitudinal sectional view,partly in'elev'ation, of a lamp embodying my invention; l j

Fig. 2 is a detail sectional view, on an en larged scale, of a portionof Fig. 1;

Fig. 3 is a detail sectional view, on an enlarged scale, on line 3 3 ofFig. 1; and

Fig. 4 is a detail, sectional view, on an enlarged scale, on line 4 4 ofFig. 1.

Referring to the drawings, and to the embodiment of my invention whichis selected for illustration, I have there shown a lamp having asuitable principal light source, or light-producing means, herein in theform of an incandescent electric bulb 5, whose rays are suitably focusedand projectedV by one or more reflectors, herein a parabolic re# flector6, disposed at the rear of the main light source, and a sphericalreflector 7, disposed forward of the main light source. Incidentally,this spherical reflector serves also as a shield to limit the range of asupplemental light source, or light-producing means, herein in the formof an incandescent electric bulb 8. It is unnecessary herein to considerthe manner in which these reflectors affect the light rays, since suchfeaturey forms the subject matter of an application,

of'another party. Itl will suffice to say that the light rays may be,vand herein are, projected through suitable light-transmitting means,herein in the form of a lens or glaza ing 9.

The lamp is provided with a suitable casing, herein comprising two parts10 and 11. In the `present instance, the part 10 constitutes the body ofthe casing, and the 'part 11 the bezel or door. rThe latter hereinservesas a mounting or frame for vthe lensor glazing 9, and to that end, thefront face of the latter is seated against a suitableseat 12, hereinformed as a part'of the bezel,`the glazing lbeing held seatedthereagainst` by appropriate means, Suchfor example as a retaining ring13, whose periphery is seated in and interlocked withav grooved' bead 14provided in the bezel 11. f

The body 10 and bezel 11k are herein telescoped, one upon the other, andone of thern,l

herein the body 10, is provided with a seat 15, against which is seateda flange 16, formed onthereflector 6. This flange, in turn, is providedwith a seat 17 for a flange 18 formed onthe'reflector 7, the latterbeing herein centered with relation to the reflector l 6 by a lip orshoulder 19, best shown in Fig.

2, formed on thev flange 16,-,and encircling the flange 18. l, Y

As a means for retaining the reflectors so seated Vone against'theother, and such other against its seat inthe casing, I have hereinprovided a retaining member in the form of a ring 20, seated against theflange 18. This ring may be, and herein is, seated in a grooved bead 21formed in the body 10 of the casing. This ring is preferably expansibleand contractible,and is normally expanded so that part of its crosssection enters the grooved bead 21, as best shown in Fig. 2. n f

As a means for holding the -retaining member 20 in place, and forsecuring the casing parts 10 and 11 together,I have provided suitablemeans, herein comprising a plurality of radial screws 22, extendingthrough perforations 23 formed in a flange 24 on the bezel 11, andextending also through bayonet slots 25 provided in a flange 26 on thebodyv 10. `The flanges 24 and 26 are mounted to turn and move axiallyone upon the other, so that the two casing parts may be locked togetherby first moving them in an axial direction to'introduce the screws 22into the bayonet slots 25,-.and then 'turn- This actionr will be readilyunderstood by CIK an inspection of Fig. 4;, Which shows *onev of thebayonet slots with the screnT therein.

Threaded on to the screws 22 are nuts 2T, Which serve a tivo-foldpurpose. ln the first place, these nuts hold their respective screws inplace, and when tightened, clamp the casing parts together'. 1n thesecond place, these nuts are utilized as a means for exerting pressureagainst the ring 2O in an axial direction against the flange 18, therebyholding the latter against its. seat 17, and also holding` the flange 16against its seat 15.

This result is herein obtained by providing a nut having a corner 28,Whose radius (represented by the line nl in 3) from the axis of the nutto such corner is slightly greater than the shortest distance 'from saidaxis to the ring 20. Assuming ythat the screw and nut are provided with,,right-hand threads, 1when the screw is turned in the direction of thearron7 B in Fig. 3 to tighten the same, the natural tendency Ais to turnthe nut about its axis in the direction of said arrow. r1`he corner 28,therefore, exerts a wedging action against the ring 2G, thereby forcingthe latter in an axial direction toward the seat 15n V1`his willnaturally tend to expand the ring radially into its bead, thus seatingthe ring firmly thereinto, and seating` the reflectors one against theother, and the latter against its seat in the casing.

rlhus it will be seen that 'there is provided a single means whichfastens the two parts of the casing together, and fastens the reflectorstherein. By simply loosening the screws 22 to the proper extent, yetWithout entirely unscreyving them, the casing parts may be separated byturning one upon the other the required distante' to bring the screwsinv line with the entrances of the bayonet slots, and then oppositelymoving the casing parts axially to Withdraw the screws from the bayonetslots. The parts are reassembled by simply reversing the foregoingoperation.

While 1 have herein shown and deserioed one specific form or embodimentof. my invention. for illustrative purposes, and have disclosed anddiscussed in detail the ron-l struction and arrangement incidental toone specific application thereof, it is to be understood that theinvention is limited neither to the mero details or relative arrange.rent of parts, nor to its specific embodiment herein shown, but thatextensive deviations from the illustrated rorm or embodiment of theinvention may be made Within the siope of: the appended claims, Withoutdeparting from the principles thereof.

Having thus described my invention, Twhat l claim d desire by LettersPatent to procure is 1. 1n a lamp, the combination of a casing in twoparts, one telescoped Within the other,

one being provided With a plurality of bayonet slots, and one beingprovided With a seat, a plurality of reflectors disposed Within saidcasing, one or" said reflectors being seated against the other, and suchother reflector being seated against said seat, a retaining member forretaining said reflectors so seated, and means 'for holding saidretaining member in place and for holding said casing parts together,said means including iastening elements located in said bayonet slots,respectively.

2. in a lamp, the combination of a casing comprisingtvvo parts, onetelescoped ivithin the other, one being provided with a plurality ofopenings, and one being provided with a seat, a reflector disposedWithin said casing and seated against said seat, and means for holdingsaid reector seated against said seat` and for holding said casing partstogether, said means comprising fastening elements extending throughsaid openings to the exterior of said casing and being operable bymovement relatively to both of said easing parts to urge said reflectoragainst said seat.

3. ln a lamp, the combination of a casing in tvvo parts, one telescopedWithin the other, one being provided with a' plurality of bayonet slots,and one being provided with a seat, a plurality of reflectors disposedWithin said casing, one of said reflectors being seated against theother, and such other reflector being seated against said seat, aretaining member for retaining said reflectors so seated, and means forholding sai d retaining member in place and for holding said casingparts together, said means including threaded elements extending throughsaid .bayonet slots, respectively. Y

Il., 1n a lamp, the combination of a casing in tivo parts one telescopedWithin the other, one being provided with a plurality of slots, and onebeing provided with a seat, a reflector disposed Within said casing andseated against said seat, and means for holding said reflector` seatedagainst said seat and for holding said casing parts together, said meansincluding` threaded elements extending from the exterior of said casingthrough said slotsq respectively and operable independently of relativemovement of said casing parts.

5. 1n a lamp, the combination of a casing in tivo parts one telescopedWithin the other,

one being provided with. a plurality of'bayonet slots, and one beingprovided with a seat, a plurality of' reflectorsdisposed Within saidcasing, one of said reflectors being seated against the other, and suchother reflector being seated against said seat, a retaining member forretaining said reflectors so seated, and means for holding saidretaining member in place and for holding said casing parts together,said means including screws extending through said bayonet slots,respectively, and ,nuts threaded onto said screws, respectively, andengaging said retaining member.-

6. In a lamp, the combination of a casing in two parts one telescopedwithin the other, one being provided with a plurality of bayonet slots,and one being provided with a seat, a reflector disposed within saidcasing and seated against said seat, and means for holding saidreflector seated against said seat and for holding said casing partstogether, said means including screws extending through said bayonetslots, respectively, and nuts threaded onto said screws, respectively,and, by relative turning movement of said screws and nuts, urging saidreflector against said seat.

7. In a lamp, the combination of a casing in two parts one telescopedwithin the other, one being provided with a plurality of bayonet slots,and one being provided with aV seat, a plurality of reflectors disposedwithin said casing, one of said reflectors being seated against theother, and such other reflector being seated against said seat, aretaining member for retaining said reflectors so seated, and means forholding said retaining member in place and for holding Said casing partstogether, saidmeans including screws extending through said bayonetslots, respectively, and nuts threaded onto said screws, respectively,and havingportions engaging said retaining member with a wedging action.

8. In a lamp, the combination of a casing in two parts,'one telescopedwithin the other, one being provided with a plurality of bayonet slots,and one being provided with a seat, a reflector disposed within saidcasing and seated against said seat, and means for holding saidreflector seated against said seat and for holding said casing partstogether, said means including screws extending through said bayonetslots, respectively, and nuts threaded onto said screws, respectively,and exerting a wedging action against said reflector to hold the latteragainst said seat.

9. In a lamp, the combination of a casing in two parts one telescopedwithin the other, one being provided with a plurality of bayonet slotsand one being provided with a seat, a plurality of reflectors disposedwithin said casing, one of said reflectors having its marginal portionseated against the other, and such other reflector having its marginalportion seated against said seat, a retaining member for retaining saidreflectors so seated, and means for holding said retaining member inplace and for holding said casing parts together, said means includingfastening elements located in said bayonet slots, respectively.

l0. In a lamp, the combination of a casing comprising twoparts, onetelescoped within the other, each being provided Ywith a plurality ofopenings, and one being provided with a seat, a` reflector housed withinsaid casing and having its marginal portion seated against said seat,and means for holding said marginal portio'n so seated and forholdingsaid casing parts together, said means including screws'extending fromthe exterior of said casing into said openings. e f

l1. In a lamp, the combination of a casing in two parts, one providedwith a generally VL-shaped bayonet slot and one being provided with aseat, a reflector disposed within said casing and -having its marginalportion seated against said seat, and means for urging said marginalportion in an axial direction against said seat andvfor holding ,p

said casing parts together, said means including a fastening elementlocated 1n said bayonet slot and exerting an axial thrust ing providedwith a plurality of openings, v

a reflector having` a marginal portion seating in a rearward directionin said casing, and means to urge said reflector rearwardly against itsseat, said means including a plurality of screws extending through said"openings to the exterior of said casing and being operable by movementrelatively to said casing to. urge saidreflector against said seat.

14. In a lamp, thecombination of a casing in two parts, one of whichpresents a seat, a redector within said casing and seated axiallyagainst said seat, and means for exerting a leverage action in an axialdirection to secure said casing parts to each other and to urge saidreflector against said seat, said means comprising an actuating elementnormally accessible and operable from the exterior of said casing.

15. In a lamp, the combination of a casing in two parts, a reflector,and means to secure said parts to each other, said means havingprovision for exerting holding pressures in an axial direction againstsaid reflector and in a radial direction with relation to said casing.

16. In a lamp, the combination of acasing in two parts, a reflector, andmeans to secure said parts to each other, said means including athreaded member exerting holding pressures in an axial direction againstsaid reflector and in a radial direction With relation to said casing.

17'. In alamp, the combination of casing in two parts, a reflector, andmeans to secure said parts to each other, said means including aradially disposed threaded mein" ber exerting` holding` pressures in anaxial direction against said reflector and in a radial direction withrelation to said easing.

18. ln a lamp, the combination of a oasing inv two parts, a reflector,and means to secure said parts to eaeh other, said means including; apair of cooperating radially disposed threaded members exerting holdingpressures in an axial direction against said i5 reiector and in a radialdirection with relation to said easing.

ln testimony whereof, I have signed my name to this specification.

ELLSVVORTM A. HAWTHORNE.

